. // //-------------------- // // Script Description: // // A simple PHP diff script I wrote for no particular reason. Its // output is similar to how Wikipedia does it, though admittedly, a // lot simpler and inferior. It works really well for predictable // comparisons, like two files that are mostly the same or a directory // listing where some files have been renamed, added or removed. // Display source code if (basename ($_SERVER['PHP_SELF']) === basename (__FILE__)) { if (isset ($_GET['source'])) { header ('Content-type: text/plain; charset=UTF-8'); exit (file_get_contents (basename (__FILE__))); } } // Replace '<' and '>' Characters function replace ($input) { return str_replace (array ('<', '>'), array ('<', '>'), $input); } // Read files $cf = replace (file_get_contents ('testdoc.txt')); // Current Version $of = replace (file_get_contents ('testdoc_old.txt')); // Old Version // Line Arrays $cv = explode ("\n", $cf); $ov = explode ("\n", $of); // Count Lines - Set to Longer Version $lc = (count ($cv) > count ($ov)) ? count ($cv) : count ($ov); // Fix Mismatched Line Counts for ($flc = count ($ov); $flc < $lc; $flc++) { $ov[$flc] = ''; } // Begin HTML Table echo '', "\n\n\n"; // Begin diff column echo '\n\n"; // Begin old version column echo '\n"; // End HTML table echo "\n\n
', "\nCurrent Version:
\n
\n";

for ($l = 0; $l < $lc; $l++) {
	// Word Arrays
	$cw = explode (' ', $cv[$l]); // Current Version
	$ow = explode (' ', $ov[$l]); // Old Version

	// Count Words - Set to Longer Version
	$wc = (count ($cw) > count ($ow)) ? count ($cw) : count ($ow);

	// Fix Mismatched Word Counts
	for ($fwc = count ($ow); $fwc < $wc; $fwc++) {
		$ow[$fwc] = '';
	}

	// If each line is identical, just echo the normal line. If not,
	// check if each word is identical. If not, wrap colored ""
	// tags around the mismatched words.
	if ($cv[$l] !== $ov[$l]) {
		for ($w = 0; $w < $wc; $w++) {
			if ($cw[$w] === $ow[$w]) {
				echo $cw[$w];
				echo ($w !== ($wc - 1)) ? ' ' : "\n";
			} else {
				echo '', $cw[$w];
				echo ($w !== ($wc - 1)) ? ' ' : "\n";
			}
		}
	} else {
		echo $cv[$l], "\n";
	}
}

// End diff column
echo "
\n		 ', "\nOld Version:
\n
\n";
echo $of, "\n";

// End old version column
echo "
\n
";